Fire-door for furnaces.



W. N. SPRINGER.

PIRE DOOR FOR FURNAGES.

APPLICATION FILED JUNE 1, 1905).v

Patented July 8, 1913.

2 SHEETS-SHEET l.

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W. N. SPRINGER.

FIRE DOOR POBI FURNACBS.

APPLIoATIoN fILBD JUNE 1, 1909.

1,066,670, Patented July 8, 1913.

2 SHEETS-SHEET 2.

@GOCDGQG wf/M @www atkwwux WILLIAM N. SPRINGER, 0F

PEORIA, ILLINOIS, ASSIGNOR TO AVERY COMPANY, A

CORPORATION OF ILLINOIS.

FIRE-DOOR FOR FURNACES.

Specification of Iletters Patent.

Patented'- Juiy e, 191e.

Application led June 1, 1909. Serial No. 499,454.

To all whom it may concern.'

Be it known that I, WILLIAM N. SPRINGER, a citizen of the United States,residing at Peoria, in the county of Peoria and State of Illinois, haveinvented certain new and useful Improvements in Fire-Doors for Furnaces,of whichthe following is a specification, reference being had therein tothe accompanying. drawing.

This invention relates to fire doors for furnaces and in particular tothose adapted and intended for use `on the furnaces of traction enginesor locomotives. It will be understood, however, that a ireloor embodyingmy invention is equally applicable to any other furnace into which it isdesirable to feed fuel by means of a shovel.

The principal objectof the invention is to produce a door of the typespecified which may be quickly and readily opened by means of a leverwithin reach of the firemans foot.

My invention further relates to various details of construction andarrangements of parts `which will be fully set forth in the followingspecification.

Of the drawings-Figure 1 is a fragmentary view showing the rear part ofa traction engine with a door embodying my invention attached. Fig. 2 isa cross sectional view through the door and the-frame. The dotted linesshow the door in the open position. Fig. 3 is'an elet/ation. Fig. 4 is acrosstsectional view through the frame and one set ofvbearings, thecorresponding door` section being shown in elevation. Fig. 5 is a detailview of one of the gear wheels.

Referring to the drawings, 1 represents y the frame of the door. Thisframe 1s adaptbearings 7 7 for tened in place by ed to be attached tothe fire-box of a boiler or to .any other suitable furnace by means ofbolts passing through the holes 2.

3 and 3 are the 4sections of the 'door which carry the tapered trunnions5, 5.

6, 6 are bea-ring bracketswhich are bolted to the framel and which havetapered the trunnions 5, 5. y

The outer endsyof the trunnions are pref.- erably square in crosssection. Gears 8 and 8 are mounted upon the s uare ends ofy thetrunnions at one end of t e -door sections and mesh with each other.They `are fasthe cotter pins 9. Each ofthe gears 8 and 8 is'formed oftwo secl be adjusted relatively proper and are provided with the lugs.4., l .are rotated, carrying with t tions 8 and 8" which Aare 4securedtogether. .essary to use by the through bolts 8 which pass through slots8d in the inner section 8". By loosening the nuts on the bolts thesection 8 may to the section 8b.

Each of the door sections 3 and 3 is provided with a plate 10 which isattached by means of the bolts 11. Each of these plates is in the formof asection of a cylinder having its axis passing through the axis ofthe corresponding trunnions, 5. The plates are intended to protect thedoor sections from the injurious effect of the heat and of the productsof combustion. These plates may be renewed from time to time, wheneversuch renewal is necessary. The door section 3 is provided with a lip l2which is formed to engage the frame' 1 and limit the motion of the doorsection. The section 3 is provided with a similar lip 13. The section `3is also provided with a lip .14: which is adapted to overlap the section3, and thus form a comparatively tight joint between the two.

15 is va pitman pivotally attached at its upper end to the gear 8 insuch a way that the downward movement of the pitman will rotate thegears to open the door sections. The lower end of the pitman is.attachedto a foot-lever 16 which is pivotally one end and provided withay spring 17 which tends to lift` the lever.

The operation of the device The inner and outer parts of the gears 8 and8 are first adjusted so that the door sections may be moved into theclosed position shown bythe full lines of Fig. 2. The correspondingpositions of the gears and the operating mechanism is shown in Fig. 1.When it 1s desired to open the doors to throw in .a shovelful of coal,the fireman depresses with his foot Ithe lever 16. `By means of thepitman 15, the glears 8 and 8 sections which assume the `positionsindicated by the dotted lines of Fig. 2. As soon as the fireman releasesthe lever 16, the spring 17 lifts it and the operation above describedis reversed brought to their closed position.

It will be understood that I do not desire to limit myselfto' the exactdetails herein shown and described, as many changes in the details maybe made within the scope of my invention. For instance, it is notnecmounted at em the door and door sections are the complete gears whichhave 11 shovelful of coal.

l proved door.

been shown, for as the an angle of somewhat grees, fragmentary gears orwould be found sutlicient sections. The foot operating mechanism which Ihave shown and described is the one which I at present able mechanismmay be used for actuating the gears.

The advantages of a fire door embodying my invention wil-l be readilyapparentto those familiar with eration of furnaces and boilers. With thesimple swing doors which are at present commonly used it is necessaryfor the fireman to open the door before picking up a This necessitatesthe door being open for a considerable time with aconsequent loss ofheat by radiation. A considerable amount of cold air goes into thefurnace and this tends not only to deaden the fire but also in time tobring the boiler into a leaky condition because of the consequentcontraction and expansion of the tlues. All of these diliiculties anddisadvantages are obviated bythe use of my im'- A still furtheradvantage incident to my improved door is that t-he fireman is morefully protected from theheat of the fire and is enabled todo his workmore comfortably and more satisfactorily. Another advantage in theconstruction which I employ is that it is entirely counterbalanced. Thesection 3 is moving downward at the same time-that the section 3a ismoving upward, and therefore the only force required is that necessaryto overcome the friction and the tensio-n of the spring 17.

am aware that various forms of doors have been proposed which may beoperated by a foot or hand lever or by power, and I do'not, therefore,claim broadly a door so operated. What I claim is:

1. In a boiler furnace door, the combination of a yvertical door frame,two parallel pairs of alined' bearings mounted on the frame in a remoteplane. parallel to and on the outer side of the vplane of the saidframe, twodoor sections normally positioned adjacent one another at theouter side of the door frame to close the opening therethrough, a pairof trunnions on one door section mounted in one pair of the said alinedbearings, a second pair of trunnions von the other door section Ymountedin the other pair `of alined bearings, gearing between the door sections-for causing the gears rotate through less than ninety demovement of oneof the sections upward about its trunnion axis along a path between thesaid axis and the frame simultaneously with the-movement of the othersection downward about its trunnion axis alongva pat-h betweenthe saidaxis and the f-frame, whereby counterbalancingis effectquadrants tooperate the door door opening and to swing oppositely about prefer butother suit-4 vsurface concentric with the lpivotal .axis of theconstruction and opl ed, and means for moving the doors, substantiallyas set forth.

2. In a furnace door,

a'door frame, and door sections adapted to normally close thepivotalpomts 1n a plane on the outer side of the plane of the said doorframe, each door sectioncomprising a main outer plate and a removableinner plate having a curved the door, substantially as set forth.

3. In a furnace door, two parallel door sections, each provided with twopivotal trunnionsin alinement with each other outside of the plane ofthe section and substantially midway bet-Ween its edges, a door frameprovided with outwardly extending bearings one for each trunnion, andtwo intermeshing gears one mounted on a trunnion of one section and theother on the corresponding trunnion of the other section, one of saidgears being adjustable angularly about lthe said trunnion axis,substantially as set forth.

4. In a furnace door, two parallel door sections, each provided with twopivotal trunnions in alinement with each other outside of the plane ofthe section and substantially lmidway between its edges, a door frameprovided with outwardly extending bearings one for each trunnion, twointermeshing gears one mounted on a trunnion of one section and theother on the corresponding trunnion of the other section, one of saidgears` being adjustable angularly about the said trunnion axis, andmechanism for ro- 100 tating said gears to open or close the said vdoorsections, substantially as set forth.

5.*In a furnace door, two parallel door sections, each provided with twopivotal trunnions in alinement with each other outside of the plane ofthe section and substani tially midwt y between its edges, a door frameprovided with outwardly extending bearings one for each trunnion, twointcrmeshing gears one mounted on a trunnion of 1.1.0 one section andthe other on the corresponding trunnion of the other section, one ofsaid gears being adjustable angularly about the said trunnion axis,mechanism for rotating said gearsto open said door sections, and .M5means for automatically closing said door` sections,-substantially asset forth.l

In -ahfurnace door, a door frame, two

door sections normally positioned adjacent one another at the outersidel of the door frame to close the ope-ning therethrough, means forpivotally mounting the sections to swing away from each other, aboutpoints in a plane outside the plane of the sections, means forconnecting the sections toinsure their simultaneous movement in oppositedirections, a'lip on one of the adjacent edges ofthe sections to overlapthe other edge when the sections are in normal position, anda lip ateach of the non-adjacent edges of the `door sections, each lip lying atan angle to the plane of the corresponding section and adapted to engagethe door frame, substantially as set forth. p y

7. In a door, a frame, bearing brackets, one at each end of the frame,each bracket being provided with two bearing apertures, two doorsections each provided with two trunnions in alinement with each otherand located in a line outside of and parallel to the plane of the doorsection, and similarly placed relative to -its edges, and each adaptedto fit into and turn' 1n the bearing aper-l tures of the brackets, lipson the door sections whereby they may engage the frame to limit theirmotion and make an overlapping joint therewith, a lip on one of thesections which overlaps 4the other section when they are in the closedposition, intermeshin gears upon the trunnions at one end of eac doorsection, and means for rotating one of the gears to move the doorsections, substantially as set forth.

I In testimony whereof I ailix my signature,

in presence of -two witnesses.

WILLIAM N. SPRINGER.

Witnesses:

H. N. BLAcKMoN, E. M. Vooizmms.

